The Old Spanish Trail (the OST) was an auto trail that once spanned the United States with almost of roadway from ocean to ocean. It crossed eight states and 67 counties along the southern border of the United States. Work on the auto highway began in 1915 at a meeting held at the Battle House Hotel in Mobile, Alabama; and, by the 1920s, the trail linked St. Augustine, Florida, to San Diego, California, with its center and headquarters in San Antonio, Texas. The work at San Antonio, and indeed nationally, was overseen by an executive committee consisting of prominent San Antonio businessmen which met at the Gunter Hotel weekly. Promoters of the Old Spanish Trail claimed that it followed the route used by "Spanish Conquistadors" 400 years earlier, but there was no continuous trail from Florida to California in Spanish times. Archives The archives of the Old Spanish Trail Association are now held in the Special Collections of the Louis J. Blume Library at St. Mary's University in San Antonio. Smaller archives are held at the St. Augustine Historical Society, Jacksonville University, and other archives along the original route. Future A decade-long centennial celebration was planned to begin in 2019 and end with a 2029 motorcade from St. Augustine to San Diego. The volunteer Old Spanish Trail Centennial Celebration Association (OST100) is collecting oral histories, travel logs and news articles related to the Old Spanish Trail to conserve the roadways, businesses and historic sites of the original auto highway. The current work of revitalization, historic preservation, public/private partnerships, restoration, and road enhancements, follows the example of the original promoters of the Old Spanish Trail, who involved diverse business and private interests in building and beautifying the original roadway. Route description The Old Spanish Trail largely follows what became, in 1927, U.S. Highway 90 east of San Antonio and U.S. Highway 80 west of Scroggins Draw, Texas. Between San Antonio and Scroggins Draw, it follows portions of U.S. Highway 87, Texas State Highway 27, and a pre-1991 alignment of U.S. Highway 290. It begins at the Huguenot Cemetery in Saint Augustine and ends at Horton Plaza Park in San Diego. Florida The Old Spanish Trail begins at St. Augustine's Mile Marker Zero of the OST, a large stone marker made of coquina at the Huguenot Cemetery off of San Marcos Avenue. The marker states "Old Spanish Trail Zero Milestone – St.